Water can be found in some crawl spaces, especially after 2-3 days of heavy rain. this can be because the earth was never fully addressed, but more often due to poor ventilation and poor ventilation technique. This air from the crawl space can enter the occupied areas of the home through the duct work of your home. To avoid damage to your home and resulting pollutants, including radon, mold, bacteria and allergens, proper moisture control techniques should be put into place.